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An EXAFS study of the Mo/TiO2 hydrodesulphurization catalysis

Kulkarni, GU and Rao, CNR (1991) An EXAFS study of the Mo/TiO2 hydrodesulphurization catalysis. In: Catalysis Letters, 11 (1). pp. 63-70.

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Abstract

In-situ EXAFS studies of sulphided Mo/TiO2 catalysts have shown that at low Mo loadings (2–4 wt%), an active species with a short Mo-S distance of 2.25 Å is formed, while on Mo/TiO2 with high Mo loadings as well as on Mo/gamma-Al2O3, bulk MoS2 (Mo-S, 2.42 Å) is formed. The species with the short Mo-S distance has Mo in an oxidation state close to 6 + and is likely to result from the sulphidation of the tetrahedral molybdate species present in the oxidic precursor at low Mo loadings. The calcination temperature of the oxidic precursor appears crucial, a high calcination temperature of 973 K favouring the formation of MoS3 on sulphidation, and a low calcination temperature of 623 K favouring MoS2.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Springer.
Keywords: HDS catalysts;Mo/TiO 2 catalyst;Mo/T-AI203 catalyst.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 09 Nov 2010 08:58
Last Modified: 09 Nov 2010 08:58
URI: http://eprints.iisc.ernet.in/id/eprint/33621

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